2018
DOI: 10.1002/ange.201806748
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How Water Accelerates Bivalent Ion Diffusion at the Electrolyte/Electrode Interface

Abstract: The effect of H2O in electrolytes and in electrode lattices on the thermodynamics and kinetics of reversible multivalent‐ion intercalation chemistry based on a model platform of layered VOPO4 has been investigated. The presence of H2O at the electrolyte/electrode interface plays a key role in assisting Zn2+ diffusion from electrolyte to the surface, while H2O in the lattice structure alters the working potential. More importantly, a dynamic equilibrium between bulk electrode and electrolyte is eventually reach… Show more

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Cited by 27 publications
(11 citation statements)
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“…It is noteworthy that as demonstrated previously, the water (both crystal water and the water in the electrolyte) plays a critical role which can enhance the zinc ion transport, electrochemical activity, as well as the reversibility. 15,22,35,44 In our case, combined with the XRD results (Figure 3), we believe Zn 2+ ions are intercalated into the gallery as a complex along with water. We observed that the interlayer spacing of Zn 2+ intercalated MVO is around 13. with no hydration.…”
supporting
confidence: 68%
“…It is noteworthy that as demonstrated previously, the water (both crystal water and the water in the electrolyte) plays a critical role which can enhance the zinc ion transport, electrochemical activity, as well as the reversibility. 15,22,35,44 In our case, combined with the XRD results (Figure 3), we believe Zn 2+ ions are intercalated into the gallery as a complex along with water. We observed that the interlayer spacing of Zn 2+ intercalated MVO is around 13. with no hydration.…”
supporting
confidence: 68%
“…The slope of EIS curves in the low frequency range in Figure 3d are following the order of CMOP > CMO > MOP > MO, demonstrating the effectively lowered Warburg resistance and facilitated ionic motion of the CMOP electrode, mainly responsible for its outstanding electrochemical performance. To the best of our knowledge, this is the first demonstration of a rechargeable ZIB cathode with such a high specific capacity and superior rate capability (Figure 3e) that substantially outweighs most recently reported MnO 2 based cathodes and other ZIB cathodes at comparable current density, such like oxygen deficient σ-MnO 2 (240 mA h g −1 at 1.0 A g −1 ), [24] α-MnO 2 (207 mA h g −1 at 0.6 A g −1 ), [19] graphene coated α-MnO 2 (220 mA h g −1 at 1 A g −1 ), [28] CNT combined α-MnO 2 (294 mA h g −1 at 0.6 A g −1 ), [15] β-MnO 2 (118 mA h g −1 at 0.8 A g −1 ), [20] layered MnO 2 (61 mA h g −1 at 1 A g −1 ), [21] ZnMn 2 O 4 (80 mA h g −1 at 1 A g −1 ), [17] NaV 3 O 8 (240 mA h g −1 at 1 A g −1 ), [37] VOPO 4 ·2H 2 O (147 mA h g −1 at 1 A g −1 ), [38] and Co 3 O 4 (162 mA h g −1 at 1 A g −1 ). [39] Long-term cycling stability becomes another demand for the widespread commercialization of Zn-MnO 2 batteries.…”
Section: Resultsmentioning
confidence: 99%
“…Moreover, for using the Zn(CF 3 SO 3 ) 2 / acetonitrile electrolyte with the VOPO 4 -based cathode for RZIB, Wang et al have showed the benefits of adding lowamounts of water to the electrolyte for improving the battery performance. 28 However, the problems associated with adding high-amounts of water were not elaborated on. We find that there is a problem of severe cathode-material dissolution which in turn affects the cycling stability.…”
Section: ■ Introductionmentioning
confidence: 99%